def __init__(self,
acceleration,
time_step,
periods,
damping=0.05,
units="cm/s/s"):
'''
Setup the response spectrum calculator
:param numpy.ndarray time_hist:
Acceleration time history [Time, Acceleration]
:param numpy.ndarray periods:
Spectral periods (s) for calculation
:param float damping:
Fractional coefficient of damping
:param str units:
Units of the acceleration time history {"g", "m/s", "cm/s/s"}
'''
self.periods = periods
self.num_per = len(periods)
self.acceleration = convert_accel_units(acceleration, units)
self.damping = damping
self.d_t = time_step
self.velocity, self.displacement = get_velocity_displacement(
self.d_t, self.acceleration)
self.num_steps = len(self.acceleration)
self.omega = (2. * np.pi) / self.periods
self.response_spectrum = None
def plot_time_series(acceleration,
time_step,
velocity=[],
displacement=[],
units="cm/s/s",
figure_size=(8, 6),
filename=None,
filetype="png",
dpi=300,
linewidth=1.5):
"""
Creates a plot of acceleration, velocity and displacement for a specific
ground motion record
"""
acceleration = convert_accel_units(acceleration, units)
accel_time = get_time_vector(time_step, len(acceleration))
if not len(velocity):
velocity, dspl = get_velocity_displacement(time_step, acceleration)
vel_time = get_time_vector(time_step, len(velocity))
if not len(displacement):
displacement = dspl
disp_time = get_time_vector(time_step, len(displacement))
fig = plt.figure(figsize=figure_size)
fig.set_tight_layout(True)
ax = plt.subplot(3, 1, 1)
# Accleration
ax.plot(accel_time, acceleration, 'k-', linewidth=linewidth)
ax.set_xlabel("Time (s)", fontsize=12)
ax.set_ylabel("Acceleration (cm/s/s)", fontsize=12)
end_time = np.max(np.array([accel_time[-1], vel_time[-1], disp_time[-1]]))
pga = np.max(np.fabs(acceleration))
ax.set_xlim(0, end_time)
ax.set_ylim(-1.1 * pga, 1.1 * pga)
ax.grid()
# Velocity
ax = plt.subplot(3, 1, 2)
ax.plot(vel_time, velocity, 'b-', linewidth=linewidth)
ax.set_xlabel("Time (s)", fontsize=12)
ax.set_ylabel("Velocity (cm/s)", fontsize=12)
pgv = np.max(np.fabs(velocity))
ax.set_xlim(0, end_time)
ax.set_ylim(-1.1 * pgv, 1.1 * pgv)
ax.grid()
# Displacement
ax = plt.subplot(3, 1, 3)
ax.plot(disp_time, displacement, 'r-', linewidth=linewidth)
ax.set_xlabel("Time (s)", fontsize=12)
ax.set_ylabel("Displacement (cm)", fontsize=12)
pgd = np.max(np.fabs(displacement))
ax.set_xlim(0, end_time)
ax.set_ylim(-1.1 * pgd, 1.1 * pgd)
ax.grid()
_save_image(filename, filetype, dpi)
plt.show()
def plot_time_series(acceleration, time_step, velocity=[], displacement=[],
units="cm/s/s", figure_size=(8, 6), filename=None, filetype="png",
dpi=300, linewidth=1.5):
"""
Creates a plot of acceleration, velocity and displacement for a specific
ground motion record
"""
acceleration = convert_accel_units(acceleration, units)
accel_time = get_time_vector(time_step, len(acceleration))
if len(velocity) > 0:
velocity, dspl = get_velocity_displacement(time_step, acceleration)
vel_time = get_time_vector(time_step, len(velocity))
if len(displacement) > 0:
displacement = dspl
disp_time = get_time_vector(time_step, len(displacement))
fig = plt.figure(figsize=figure_size)
fig.set_tight_layout(True)
ax = plt.subplot(3, 1, 1)
# Accleration
ax.plot(accel_time, acceleration, 'k-', linewidth=linewidth)
ax.set_xlabel("Time (s)", fontsize=12)
ax.set_ylabel("Acceleration (cm/s/s)", fontsize=12)
end_time = np.max(np.array([accel_time[-1], vel_time[-1], disp_time[-1]]))
pga = np.max(np.fabs(acceleration))
ax.set_xlim(0, end_time)
ax.set_ylim(-1.1 * pga, 1.1 * pga)
ax.grid()
# Velocity
ax = plt.subplot(3, 1, 2)
ax.plot(vel_time, velocity, 'b-', linewidth=linewidth)
ax.set_xlabel("Time (s)", fontsize=12)
ax.set_ylabel("Velocity (cm/s)", fontsize=12)
pgv = np.max(np.fabs(velocity))
ax.set_xlim(0, end_time)
ax.set_ylim(-1.1 * pgv, 1.1 * pgv)
ax.grid()
# Displacement
ax = plt.subplot(3, 1, 3)
ax.plot(disp_time, displacement, 'r-', linewidth=linewidth)
ax.set_xlabel("Time (s)", fontsize=12)
ax.set_ylabel("Displacement (cm)", fontsize=12)
pgd = np.max(np.fabs(displacement))
ax.set_xlim(0, end_time)
ax.set_ylim(-1.1 * pgd, 1.1 * pgd)
ax.grid()
_save_image(filename, filetype, dpi)
#plt.show()
plt.clf()
def __init__(self, acceleration, time_step, periods, damping=0.05,
units="cm/s/s"):
'''
Setup the response spectrum calculator
:param numpy.ndarray time_hist:
Acceleration time history [Time, Acceleration]
:param numpy.ndarray periods:
Spectral periods (s) for calculation
:param float damping:
Fractional coefficient of damping
:param str units:
Units of the acceleration time history {"g", "m/s", "cm/s/s"}
'''
self.periods = periods
self.num_per = len(periods)
self.acceleration = convert_accel_units(acceleration, units)
self.damping = damping
self.d_t = time_step
self.velocity, self.displacement = get_velocity_displacement(
self.d_t, self.acceleration)
self.num_steps = len(self.acceleration)
self.omega = (2. * np.pi) / self.periods
self.response_spectrum = None